Black-out port ventilator



May 16, 1944.

D. E. DODGSON BLACK-OUT PORT VENTILATOR Filed Oct. 19. 1942 MM T 5 6 NM MD ME w m D TTORNEY.

Patented May 16, 1944 UNITED STATES PATENT OFFICE BLACK-OUT PORT VENTILATOR David E. Dodgson, San Pedro, Calif. Application October 19, 1942, Serial No. 462,503

1 Claim.

This invention relates to a blackout port ventilator whereby in time of war when it is necessary that no light be shown in a ship to enable various compartments within the ship to receive an adequate supply of fresh air. During daylight hours, the usual air scoop in the porthole of a ship deflects air into a compartment within the ship, but at night the porthole must be closed, or provided with a suitable blackout arrangement so that no light will show.

An object of my invention is to provide a novel blackout port ventilator which can be readily placed in the air scoop which is fitted in the porthole in order to provide ventilation and also prevent the emission of light. During daylight hours, my ventilator may be removed from the wind deflector or scoop, leaving the deflector in its normal position.

Another object of my invention is to provide a novel blackout port ventilator of the character stated which is simple in construction, effective in operation, and inexpensive to manufacture.

Other objects, advantages, and features of invention may appear from the accompanying drawing, the subjoined detailed description, and the appended claim.

In the drawing Figure 1 is a longitudinal sectional view of my blackout port ventilator.

Figure 2 is a front elevation of the same, with parts broken away to show interior construction.

Figure 3 is a top plan view of the blackout insert sleeve.

Referring more particularly to the drawing, the numeral l indicates the usual and well-known air deflector, or scoop, which is inserted through the porthole of a ship, and deflects the air inwardly through the porthole and into a compartment of the ship, all of which is usual and well known. The wind scoop includes a bead 2 on the inner end thereof, which limits the outward movement of the scoop, and a transverse handle 3 is provided and fixedly attached to the body of the scoop whereby the scoop can be removed from the porthole, or placed in position when desired.

My blackout insert comprises a sleeve 4 which fits the inner cylindrical portion 5 of the scoop I. A plurality of transversely extending baflles 6 is provided in the sleeve 4. These baffies are partial discs and are spaced at one end from the wall of the sleeve 4, as shown at l. The partial discs 6 overlap, thus providing a tortuous passage for the incoming air, and also providing effective bafiles preventing the emission of light through the porthole.

I have illustrated three passages although more may be employed, if desired. The inside of the air scoop l, and also the inside of the blackout insert sleeve 4, and both surfaces of the bafiles 6 are painted black, or some other suitable lightabsorbing and non-reflecting color, so that no light will show from the outside of the ship. The baflies 6 are spaced axially in the sleeve 4 so that light is not reflected from one bafile to the other, and thence out through the air scoop I.

Having described my invention, I claim:

A port ventilator comprising a tubular air scoop open at its inner and outer ends and of a length and diameter adapting it to fit snugly in a porthole and project outwardly therefrom, abutment means about the inner end of said scoop for limiting outward movement thereof through the porthole, the outwardly projecting portion of said scoop being cut diagonally along one side, a sleeve removably received through the outer endthereof and fitting snugly therein between the diagonally out outer portion of the scoop and the open inner end thereof, a bar mounted diametrically through the inner end of the scoop and serving as a handle for the scoop and as a stop for the inner end of the sleeve, and bafiie plates in said sleeve spaced from each other longitudinally thereof, said plates being secured in marginal engagement with opposite side portions of the wall of the sleeve and extending in opposite directions transversely in the sleeve with their free end portions overlapped to provide a tortuous passage through the sleeve.

DAVID E. DODGSON. 

